Dry Sorbent Injection and Material Handling for APC was the Hot Topic for Thursday, June 20, 2013

 

Removing mercury, SO2 and HCl can only take place if the sorbent comes in contact with the pollutant.  The five speakers in the Hot Topic session yesterday provided insights on making the contact more efficient and or less costly.

 

Clayton (Clay) Erickson, PhD, General Manager and Vice President of Environmental Technology at Babcock Power UK Limited, discussed mixing and flow modeling techniques used to improve DSI performance. While the application of gas-gas static mixers in the design of SCR for DeNOx is well proven, several areas of recent work with powder-gas mixing such as DSI for SO2/SO3/HCl control and Powder Activated Carbon (PAC) for mercury control were the focus of this presentation.  The Delta Wing Static Mixer is well proven for distributing ammonia prior to the SCR.  A number of full scale projects have also proven its ability to distribute activated carbon and powdered lime and soda ash.

 

Bobby I.T. Chen, Client Program Manager, Integrated Emission Solutions, Environmental & Infrastructure at CB&I, provided the “EMO™+HL Total MATS Compliance Solution.” There are critical reasons to enhance mercury oxidization using CB&I's technology because controlling mercury (Hg) emission from the coal combustion process is best achieved through a two-stage process. The first stage is to promote mercury oxidization at the combustion chamber outlet. The second stage is to provide absorbent to capture the oxidized mercury. On numerous of CB&I’s field EMO trials, EMO has been proven to achieve 90 percent plus Hg oxidization, thus facilitating the downstream AQCS Hg control efficiency. Furthermore, EMO was found to be the most cost-effective way of controlling stack Hg.

 

Keith Day, Business Development Manager for Nol-Tec Systems Sorb-N-Ject Technology, discussed "Gen 3" material handling for ACI systems. This system is appropriate when longer runs are needed to convey the sorbent from storage to the injection point.

 

 Charles S. Alack, President of Semi-Bulk Systems, Inc., discussed “Dry Sorbent Handling and Injection into the Scrubber and/or Direct into the Furnace for Hg and SO2 Removal.”  He reviewed options for applying the VACUCAM® Ejector Mixer processes for efficient slurry production from lime or limestone powders. The technology also offers processes to accommodate other dry chemicals required for scrubber treatment. Processes for handling dry sorbent and chemical injection for removal of Hg and SO2 from direct in-furnace treatment systems are also available

 

Jim Gilmour, Environmental Systems & Services Product Manager for Sorbent Injection Systems at Siemens, discussed some of the critical variables affecting the performance of sorbents for control of acid gases and mercury emissions from coal-fired boilers to achieve compliance with MATS regulations. He also discussed the selection of sorbents and reviewed some of the important system requirements. There are many site specific aspects which need to be considered, so it is valuable to engage a company which can factor in all the needs in the system design.

 

 

Bios, Abstracts and Photos can be seen at: BIOS, ABSTRACTS, PHOTOS - 6-20-13.htm

 

 The individual presentations are as follows: